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You really don't have a big enough tank for three hermit cabs. They can get territorial as well. I would suggest taking two of them back to the store. I would also get a few empty shells to place in the tank for your one remaining hermit crab to use as he grows or he could start killing off your bigger snails trying to get a new shell

It would, however, be a good idea to get more snails. Maybe another 8 to 10 astrea snails. The snails will also help you keep the glass clean.

If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease."Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony CalfoFishless CycleCycling with FishMarine Aquarium Info [URL="http://saltwater.aquaticcommunity.com/"]